I have only been there once and I have forgotten about how it is marked, but there is a very nice historical society and they also have a genealogy room with a number of things listed. They were extremely helpful when I visited it.
It is easy to find from Hiway 54, turn north on the main street--I don't recall how far but not very far from where you turn. You turn left then and it is a fairly new brick building on the north side of the street. It is across the street north from the court house. A gentleman working there even took me across the street to the court house to the right room to look at school records. Here is information how to contact them.
120 West 4th Street
Eureka, KS 67045-1445
9am - 4pm, Mon-Frigwhistory@sbcglobal.net
I am sure they can answer your question.